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		<h1>Node Types</h1>
		<p>These node types have been proposed and some are implemented.</p>
	<ul>
		<li>Start [first node in the node list]</li>
		<li>End[last node in the node list]</li>
		<li>Sum (Concatinate) [sums all <span data='{"ref":"arc_types_get"}'>get</span> arcs in <span data='{"ref":"arc_order"}'>order</span> and stores the result in data]</li>
		<li>Subtract (difference) [see Sum but it negates subsequent get arcs]</li>
		<li>Multiply (repeat) []</li>
		<li>Divide (slice) []</li>
		<li>Divide (slice) []</li>
		<li>Divide (slice) []</li>
		<li>Divide (slice) []</li>
		
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